A US Marine Corps veteran with suspected mental health issues killed 12 people in a busy bar in California, including a policeman, officials say.
The shooting began at 23:20 local time on Wednesday in Thousand Oaks about 40 miles (65km) north-west of Los Angeles.
At least 200 people were reportedly inside the Borderline Bar and Grill, which was hosting a student line-dancing night.
Police named the suspect as 28-year-old Ian David Long.
Earlier this year, police mental health professionals cleared him after he was found behaving “irrationally” at his home, said authorities.
Police say the suspect was dressed in black, and forced his way into the bar after shooting the bouncer.
A college country music night was under way when the suspect apparently threw a smoke grenade before opening fire, witnesses say.
Police say he used a legally owned .45 calibre Glock semi-automatic handgun, which had an extended magazine that is illegal in the state of California.